Main controlling factors of oil and gas enrichment and favorable zones: Case study of 3rd and 4th members of Ordovician Yingshan Formation, northern slope of Tazhong Uplift, Tarim Basin
Received date: 2020-09-27
Revised date: 2020-11-25
Online published: 2021-04-09
Supported by
The National Key Research and Development Program(2019YFC0605505)
the Scientific Research and Technology Development Project of China National Petroleum Corporation(2020D-5010-28)
In the Tazhong Uplift of Tarim Basin, the discovery of high yield oil of 3rd and 4th members of Ordovician Yingshan Formation reveals two new hydrocarbon reservoirs, which indicate broad prospect for exploration. But the coexistence of successful and unsuccessful drillings makes it difficult to determine the pattern of hydrocarbon accumulation, and how to find favorable zones becomes the core problem of efficient exploration. In this paper, the major controlling factors of hydrocarbon accumulation is studied by drillings, high quality 3D seismic data and the field outcrop with corresponding geophysical techniques. According to this, the favorable zone of accumulation was predicted. The research results show that, Cambrian source rocks are the main source of oil in the area, adjacent hydrocarbon generation depression is the most favorable material basis for hydrocarbon accumulation. Grand Ⅰand Ⅱ northeast trending slide faults break through the whole area, which communicate deep cold warfare hydrocarbon source rock effectively. And the slides play an effective path for lateral dredging and vertical adjustment of hydrocarbon. Because of the segmented activity intensity, the pinnate fracture zone is the dominant area for hydrocarbon accumulation. The tight limestone of the 1st and 2nd members of Yingshan Formation and the several hundred meters mudstone of the Sangtamu Formation prevented the upward escape of oil and gas, which is another guarantee for oil and gas accumulation. Based on the above understanding, the forward modeling is used to analyze the seismic emission characteristics of fracture-body reservoir, which is in good agreement with the drilling, so as to determine the favorable exploration zone and provide the technical support for the exploration.
Ting-ting KANG , Feng-quan ZHAO , Xin LIU , Xiao-xue WANG , Yan YI , Hao HE , Xin-xin WANG , Min ZHANG . Main controlling factors of oil and gas enrichment and favorable zones: Case study of 3rd and 4th members of Ordovician Yingshan Formation, northern slope of Tazhong Uplift, Tarim Basin[J]. Natural Gas Geoscience, 2021 , 32(4) : 577 -588 . DOI: 10.11764/j.issn.1672-1926.2020.12.005
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